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When a stimuli is taken by your nerves that the brain perceives as threatening. The SNS produces de fight or flight response.

Nervous system signals are sent to glands located by the kidneys. They release hormones into your blood. The main one epinephrine(adrenaline)

Adrenaline courses through your blood stream and affects the functioning of a large number of organs and tissues, including the heart and lungs. After a time, the body breaks down the hormone, so its levels decrease in the body. In addition, the parasympathetic nervous system sends signals out to the body to essentially calm down and return to resting state.